Officials are trying to figure out who is behind a threatening email sent to staff members at Granite Hills High School in El Cajon.
The Grossmont Union High School District assigned one extra police officer to patrol the school on Monday due to the threat. District officials say the threat came from a person pretending to be a student, but police believe the threat is not credible.
Student Eli Vasquez said he knew something was up when he saw an extra officer on campus Monday.
"I'm surprised because why would someone do that?" said Vasquez. "I thought it was because we came back from break. I didn't think much about it, but now I know why."
Officials say the email that contained threatening remarks was sent to several staff members on Sunday night from a person posing as a current student.
"… Why would you fake to be a student? I don't understand," said Vasquez.
One student told 10News, "It could be someone needing attention."
Another added, "Probably a student getting back at a teacher for bad grades."
School officials did not confirm if the emails were sent to teachers or administrators.
Authorities are investigating the emails.